SAMPLE STORAGE AND ITS IMPACT ON PO4 MEASUREMENT AND ICP MEASUREMENT RESULTS (PART 2)

[Dan_P]

IIRC, Triton says they have already evaluated effects over time and see no significant changes.

Can you share their data, report, slides so we can evaluate? Conflict of interest is a good reason to be skeptical about their conclusion.

 

[Randy Holmes-Farley]

Can you share their data, report, slides so we can evaluate? Conflict of interest is a good reason to be skeptical about their conclusion.

Nothing so elaborate. We asked if the time in shipping was an issue due to bacterial growth or precipitation, and they indicated that they had tested it and it was not. I don't have the exact link, but I think it was in the chemistry forum here.

 

[Randy Holmes-Farley]

I couldn't find the Triton answer I was looking for, but Craig Bingman discussed stability and shipping here:

Reefs dot com article on triton testing

I don't want to have to acidify my samples. I understand it may introduce error. But I don't want to have to acquire very pure and strong acid. Nor do I want to keep such acid around for something I may only do couple times of year. This would make a simple to use inexpensive test much more...

www.reef2reef.com

 

[Dan_P]

I couldn't find the Triton answer I was looking for, but Craig Bingman discussed stability and shipping here:

Reefs dot com article on triton testing

I don't want to have to acidify my samples. I understand it may introduce error. But I don't want to have to acquire very pure and strong acid. Nor do I want to keep such acid around for something I may only do couple times of year. This would make a simple to use inexpensive test much more...

www.reef2reef.com

Thank you thank you thank you!

Here is the link to the Skeptical Reefkeeping article at the top of this post that examines Triton’s claims. Boy oh boy!

After reading this article, I feel that @Rick Mathew ’s observations and the mechanism proposed for ICP phosphorous measurement inaccuracies are probably correct. I hope he has the budget to determine whether 2% nitric acid helps improve ICP results, though it might then turn out that hobby ICP results are inherently noisy.

Dan

Skeptical Reefkeeping 12

Triton Lab ICP-OES Testing of a Certified Artificial Saltwater Standard By Rich Ross and Dr. Chris Maupin At MACNA 25 in Denver, the potential for the new

reefs.com